“Given the large amount of nuclear isotopes in Mars atmosphere resembling those from hydrogen bomb tests on Earth, Mars may present an example of civilization wiped out by a nuclear attack from space,” Dr Brandenburg told the Motherboard website.

“Such hostile forces could range from things as alien as AI ‘with a grudge’ against flesh and blood, as in the movie Terminator, all the way to things as sadly familiar to us as a mindless humanoid bureaucrat like Governor Tarkin in Star Wars, eager to destroy planet Alderann as an example to other worlds.”

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